​

  ​ ​ ​

For the year ended September 30, 2025

​

​

(U.S.$ thousand)⁽¹⁾

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

Community

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

Payments for

​

and social

​

​

​

​

​

​

​

​

​

​

Production

​

​

​

​

​

infrastructure

​

responsibility

​

​

​

  ​ ​ ​

Taxes

  ​ ​ ​

Royalties

  ​ ​ ​

Fees

  ​ ​ ​

Entitlements

  ​ ​ ​

Bonuses

  ​ ​ ​

Dividends

  ​ ​ ​

improvements

  ​ ​ ​

payments

  ​ ​ ​

Total

United States

​

  ​

​

  ​

​

  ​

​

  ​

​

  ​

​

  ​

​

  ​

​

  ​

​

  ​

Compass Minerals International, Inc.

​

11,741

(2)

—

​

—

​

—

​

—

​

—

​

—

​

—

​

11,741

Cote Blanche Island

​

—

​

—

​

—

​

—

​

—

​

—

​

—

​

—

​

—

Lyons

​

—

​

—

​

—

​

—

​

—

​

—

​

—

​

—

​

—

Ogden – SOP

​

—

​

—

​

—

​

—

​

—

​

—

​

—

​

—

​

—

Ogden – Solar Salt

​

—

​

—

​

—

​

—

​

—

​

—

​

—

​

—

​

—

Ogden – Magnesium Chloride

​

—

​

—

​

—

​

—

​

—

​

—

​

—

​

—

​

—

Canada

​

  ​

​

  ​

​

  ​

​

  ​

​

  ​

​

  ​

​

  ​

​

  ​

​

​

Compass Minerals Canada Corp.

12,168

(3)

—

—

—

—

—

—

—

12,168

Amherst

—

—

—

—

—

—

—

—

—

Goderich Mine

228

(4)

2,372

—

—

—

—

—

—

2,600

Goderich Plant

61

(5)

—

—

—

—

—

—

—

61

Unity

107

(6)

113

—

—

—

—

—

—

220

United Kingdom

​

  ​

  ​

  ​

  ​

  ​

  ​

  ​

​

Winsford

5,230

(7)

—

—

—

—

—

—

—

5,230

Total

29,535

2,485

—

—

—

—

—

—

32,020

(1)

All payments are reported in U.S. dollars. Payments relating to projects in Canada were made in Canadian dollars and payments relating to the project in the United Kingdom were made in British pound sterling. Such payments made in currencies other than in U.S. dollars have been converted to U.S. dollars using the exchange rates as of September 30, 2025.

(2)

Compass Minerals International, Inc. (the “Company”) files a consolidated income tax return in the U.S., which includes all U.S. entities including the projects listed. The U.S. Federal Government levies corporate income taxes at the consolidated group level rather than on a per-project basis.  Accordingly, the Company has disclosed payments of taxes at the U.S. consolidated group level. The payments relate not to particular projects but to the consolidated U.S. income of the Company. The reported amount represents $11,741 thousand of Federal income taxes paid to the U.S Federal Government.

(3)

Compass Minerals Canada Corp. files a consolidated income tax return. The Government of Canada levies corporate income taxes at the entity level rather than on a per-project basis. The reported amount represents $9,622 thousand of income taxes on entity-level profits paid to the Canada Revenue Agency, $768 thousand of provincial-level income taxes on entity-level profits paid to the Province of Quebec and $1,778 thousand of provincial-level mining taxes on entity-level profits paid to the Province of Ontario.

(4)

Represents property taxes paid to the Town of Goderich attributable to Goderich Mine.

(5)

Represents property taxes paid to the Town of Goderich attributable to Goderich Plant.

(6)

Represents property taxes.

(7)

Includes $5,147 thousand in income taxes and $489 thousand of property taxes paid in fiscal year 2025, partially offset by $406 thousand of income tax refunds received in fiscal year 2025.

​

  ​ ​ ​

For the year ended September 30, 2025

​

​

(U.S.$ thousand)⁽¹⁾

​

​

​

  ​ ​ ​

​

  ​ ​ ​

​

  ​ ​ ​

​

  ​ ​ ​

​

  ​ ​ ​

​

  ​ ​ ​

​

  ​ ​ ​

Community

  ​ ​ ​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

Payments for

​

and social

​

​

​

​

​

​

​

​

​

​

Production

​

​

​

​

​

infrastructure

​

responsibility

​

​

​

​

Taxes

​

Royalties

​

Fees

​

Entitlements

​

Bonuses

​

Dividends

​

improvements

​

payments

​

Total

United States

  ​

  ​

  ​

  ​

  ​

  ​

  ​

  ​

  ​

U.S. Federal Government

11,741

—

—

—

—

—

—

—

11,741

Canada

  ​

  ​

  ​

  ​

  ​

  ​

  ​

  ​

  ​

Government of Canada

9,622

—

—

—

—

—

—

—

9,622

Government of Ontario

1,778

2,372

—

—

—

—

—

—

4,150

Government of Saskatchewan

—

113

—

—

—

—

—

—

113

Government of Quebec

768

—

—

—

—

—

—

—

768

Rural Municipality of Round Valley No. 410

107

—

—

—

—

—

—

—

107

Town of Goderich

289

—

—

—

—

—

—

—

289

United Kingdom

  ​

  ​

  ​

  ​

  ​

  ​

  ​

  ​

  ​

Government of the United Kingdom

4,741

—

—

—

—

—

—

—

4,741

Cheshire

489

—

—

—

—

—

—

—

489

Total

29,535

2,485

—

—

—

—

—

—

32,020

(1)

All payments are reported in U.S. dollars. Payments relating to projects in Canada were made in Canadian dollars and payments relating to the project in the United Kingdom were made in British pound sterling. Such payments made in currencies other than in U.S. dollars have been converted to U.S. dollars using the exchange rates as of September 30, 2025.

For the year ended September 30, 2025

Subnational

  ​ ​ ​

​

  ​ ​ ​

​

  ​ ​ ​

​

  ​ ​ ​

​

  ​ ​ ​

​

  ​ ​ ​

Amount

Jurisdiction

​

Government

​

Business segment

​

Project

​

Resource

​

Extraction Method

​

(U.S.$ thousand)⁽¹⁾

United States

​

  ​

​

  ​

​

  ​

​

  ​

​

  ​

​

  ​

U.S. Federal Government

​

U.S. Federal Government

​

All

​

Compass Minerals International, Inc. (U.S. consolidated group level)⁽²⁾

​

N/A

​

N/A

​

11,741

Louisiana

​

U.S. Federal Government

​

Salt

​

Cote Blanche Island

​

Rock Salt

​

Underground Mining

​

—

Kansas

​

U.S. Federal Government

​

Salt

​

Lyons

​

Mechanically-Evaporated Salt

​

Well

​

—

Utah

​

U.S. Federal Government

​

Plant Nutrition

​

Ogden – SOP

​

SOP

​

Well

​

—

Utah

​

U.S. Federal Government

​

Salt

​

Ogden – Solar Salt

​

Solar Salt

​

Well

​

—

Utah

​

U.S. Federal Government

​

Salt

​

Ogden – Magnesium Chloride

​

Magnesium Chloride

​

Well

​

—

Total

​

​

​

  ​

​

  ​

​

  ​

​

  ​

​

11,741

Canada

  ​

  ​

  ​

  ​

  ​

  ​

Government of Canada

Government of Canada

Salt

N/A⁽³⁾

​

N/A

N/A

9,622

Quebec

Quebec

Salt

N/A⁽⁴⁾

​

N/A

N/A

768

Ontario

Government of Ontario

Salt

Goderich Mine

​

Rock Salt

Underground Mining

4,150

Ontario

Town of Goderich

Salt

Goderich Mine

​

Rock Salt

Underground Mining

227

Ontario

Town of Goderich

Salt

Goderich Plant

​

Mechanically-Evaporated Salt

Well

62

Saskatchewan

Rural Municipality of Round Valley No. 410

Salt

Unity

​

Mechanically-Evaporated Salt

Well

107

Saskatchewan

Rural Saskatchewan

Salt

Unity

​

Mechanically-Evaporated Salt

Well

113

Total

​

  ​

  ​

​

  ​

  ​

15,049

United Kingdom

  ​

  ​

  ​

​

  ​

  ​

  ​

United Kingdom

United Kingdom

Salt

Winsford⁽⁵⁾

​

Rock Salt

Underground Mining

4,741

Cheshire

Cheshire

Salt

Winsford

Rock Salt

Underground Mining

489

Total

​

  ​

  ​

  ​

  ​

5,230

(1)

All payments are reported in U.S. dollars. Payments relating to projects in Canada were made in Canadian dollars and payments relating to the project in the United Kingdom were made in British pound sterling. Such payments made in currencies other than in U.S. dollars have been converted to U.S. dollars using the exchange rates as of September 30, 2025.

(2)

The Company files a consolidated income tax return in the U.S.  The U.S. Federal Government levies corporate income taxes at the consolidated group level rather than on a per-project basis.  Accordingly, the Company has disclosed payments of taxes at the U.S. consolidated group level.  The payments relate not to particular projects but to the consolidated U.S. income of the Company.

(3)

Compass Minerals Canada Corp. files a consolidated income tax return. The Government of Canada levies corporate income taxes at the entity level rather than on a per-project basis.

(4)

Compass Minerals Canada Corp. files a consolidated income tax return. The Government of Quebec levies corporate income taxes at the entity level rather than on a per-project basis.

(5)

The reported amount represents income taxes paid of $5,147 thousand in fiscal year 2025, partially offset by $406 thousand of income tax refunds received in fiscal 2025.